Practical picture
The antenna system determines where your RF goes and how efficiently it gets there. Learn polarization, gain, resonance, feed-line loss, SWR, tuners, and connectors.
T9 · Antennas & Feed Lines
T9 Antennas & Feed Lines
The antenna system determines where your RF goes and how efficiently it gets there. Learn polarization, gain, resonance, feed-line loss, SWR, tuners, and connectors.
Technician exam focus
T9 has 2 question groups and contributes 2 questions to a Technician exam — one from each group.
Subelement T9
Antennas & Feed Lines
Work through the groups below in any order. Each page teaches the idea in normal language while keeping the tested terminology recognizable.
T9A · 11 pool questions
Antennas, Polarization, Gain & Resonance
Vertical/horizontal polarization, gain, beam antennas, loading, portable/mobile antennas, resonant length, and dipole patterns.
Study T9A →T9B · 12 pool questionsFeed Lines, SWR, Tuners & RF Connectors
Coax/feed-line types, attenuation, SWR, antenna tuners, RF connectors, and weather protection.
Study T9B →Close the loop
Quiz Me on T9
Study the concepts here, then use the current public-domain Technician pool to see how they are asked on the exam.
Exam scope: NCVEC 2026–2030 Technician Class (Element 2), effective July 1, 2026 through June 30, 2030, with February 19, 2026 errata. The current NCVEC pool is the exam authority; explanatory prose here is SPARKA teaching material. NCVEC pool